My grocery store has finally started carrying dried fava beans, so I was able to follow up on my earlier pea-based horsebread experiment. I livetweeted the process (perhaps one of the odder things I have done, but a very useful way to organize my notes and thoughts). The main thread can be found here. This spawned some metathreads, like this one on the size and shape of loaves and the caloric needs of horses; and this one on general nutrition.
Yes, I ate the horsebread porridge.